.book{
    width: 800px;
    margin: 20px auto;
    border-collapse: collapse;
}
.book caption{
    color:#333;
    font:35px/80px '微软雅黑';
}
.book tr td,.book tr th{
    padding: 8px;
    border:1px solid gray;
    text-align: center;
}

.book tr:hover{
    background-color: #f8f8cb;
}

.aa{

}